Well, so far I've gone 5DIII to OM-D E-M10 and will almost certainly stick with it.

Obviously I don't get the DoF I love with the 135L, or the AF speed of the 400L, but for day to day its just as good and considerably smaller.Worth noting that those shortcomings may be overcome on the FF mirrorless offerings, but from what I've read the AF is too slow on those systems.

I have found (at least on mine) that CAF is poor, but SAF oddly makes up for it - I can just tap the screen and get a clear in focus shot of my daughter bezzing along on her scooter straight toward the camera.

I bought a 5DII and an E-M1 in the winter to try them both out and decide before the birding season began in the spring. I shoot 95% with a Canon 400/5.6 and a high grade 600mm/6.3 astro telescope, both wide open and MF, naturally. I spent many hours testing, both with charts and test setups, and with real world situations. I sold the 5DII two months later, and in spite of some drawbacks, have stuck with the E-M1 and get fantastic results from both lenses, as well as from my various 4/3 lenses and a 75-300mF/T lens I bought for travel. Here are a few of samples:

Distance, about 30 meters. Same position, same lens, and same settings. No sharpening or NR.

With the advent of the 7DII I am having to think it all over again. AF would be nice, but the E-M1 is for sure better to use with my scope, so a switch would also entail a 500mm or 600mm Big White Monster, or perhaps the new Sigma 150-600S. something to think about on our LONG winter nights...

RGNY wrote in post #17303370Has anyone made the switch and going to stay with it?

When I first got into 4/3 gear, I was very tempted to completely switch- but what ended up happening instead was I slimmed out my dSLR gear to the "basics" and now have a decent kit for both systems. Occasionally I still ponder doing this, but my major hang up right now is the high ISO performance in video (and to a lesser extend images). There are times that I'm shooting video at 6400 ISO and at those kinds of ISOs a FF camera is just better. Its also hard for me to give up the convenience of thin DoF with a zoom lens.

The irony isn't lost on me that perhaps one of the best consumer video cameras (GH4) is 4/3 and video is what prevents me from jumping completely in.

I went from a 50d to a em-5 when it was first released. I loved the weight, but there was something about the image quality that wasn't there for me. I wasn't liking the photos I was getting. Sold the em-5 and went to a 6d. I'm loving the results but I miss the weight

I bought (and still have) an E-M5 to try out m43. I was convinced that I would sell my Canon gear and switch to m43. I wanted the lighter system to use while backpacking. Carrying heavy camera equipment is not an option on most of my trips. Unfortunately the auto focus is not anywhere as good as a DSLR (even when compared to the 5D's). When I first bought the camera I took it to the dog park just to try it out. I was only able to focus on a running dog once or twice. The camera itself is built very well, better than the current xxD offerings by Canon.

I've read that the E-M1 is much better in focusing, but I've never used one.

st3mpy wrote in post #17305096I bought (and still have) an E-M5 to try out m43. I was convinced that I would sell my Canon gear and switch to m43. I wanted the lighter system to use while backpacking. Carrying heavy camera equipment is not an option on most of my trips. Unfortunately the auto focus is not anywhere as good as a DSLR (even when compared to the 5D's). When I first bought the camera I took it to the dog park just to try it out. I was only able to focus on a running dog once or twice. The camera itself is built very well, better than the current xxD offerings by Canon.

I've read that the E-M1 is much better in focusing, but I've never used one.

You didn't make the same mistake I did at first did you - using continuous focus? I know its counter intuitive and totally the opposite of everything you'll have learnt with Canon but you'll get much better results with single shot than continuous (which truly is rubbish!)

I have added a OM-D E-M1 to my kit and I've decided that I'll be sticking with both Micro Four Thirds and a slimmed down DSLR setup as well. They are both fantastic systems each with their own advantages over the other. This being said I can foresee the E-M1 getting more use than my Canon gear due to the ease of portability. It is an attribute that is becoming harder to overlook. Regarding the above comments about getting action/moving shots I agree that the continuous AF tracking leaves much to be desired but I've gotten around it by using the touch display set up for on shot focus. I simply follow the action and click away with my finger to take shots. This method often gets me as many keepers as the sometimes finicky Ai Servo on the 5D3.

Sometimes not taking a photograph can be as problematic as taking one. - Alex Webb

I went to an OMD while keeping my D700, enjoyed iy very much, but found small reliability and servicing issues to be sub standard (exposure problem had to be fixed). I eventually traded it in, bought a Df, and recently a 6D, back to DSLRs. The photos of the OMD are good, but lacking something compared to the big boys.

John_N wrote in post #17305563You didn't make the same mistake I did at first did you - using continuous focus? I know its counter intuitive and totally the opposite of everything you'll have learnt with Canon but you'll get much better results with single shot than continuous (which truly is rubbish!)

I'll have to take it out for a spin again. TBH I haven't been using it since I had the plans to sell it and didn't want to get attached to it!

RGNY wrote in post #17303370Has anyone made the switch and going to stay with it?

Made the switch. Very satisfied. Who knows the future?

You, the OP, should tell us what you shoot. I am using and OMD-EM1 with the 12-40 Pro zoom and the Pany 35-100. These lenses in combination with the sensor on the EM1 far outshine my 5DII, with the 24-105 L and the 70-200 L lenses. It is not even a close call. But this has to be put into perspective: I am not doing little children on the run, or other wildlife. The stationary auto and manual focus is superior (much) to the 5DII. The E-M1 is weather sealed and rugged. The touch screen is great advantage in the field. It's a complicated beast to master but great fun to use.

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